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Property, Plant, and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [abstract] |
Disclosure of detailed information about property, plant and equipment | Estimated remaining useful lives of the components of depreciable assets, categorized by asset class, are as follows:
Hydro generation | 1-52 years
Wind generation | 1-29 years
Gas generation | 1-17 years
Coal generation | 1-29 years
Mining property and equipment | 1-9 years
Capital spares and other | 2-52 years
A reconciliation of the changes in the carrying amount of PP&E is as follows:
| Land | Coal generation | Gas generation | Renewable generation | Mining property and equipment | Assets under construction | Capital spares and other(1) | Total
Cost |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | 94 |  | 5,937 |  | 1,964 |  | 3,286 |  | 1,338 |  | 200 |  | 383 |  | 13,202 |
Adjustments on implementation of IFRS 16 | — |  | — |  | — |  | (7) |  | (101) |  | — |  | — |  | (108) |
Additions | — |  | — |  | — |  |  | — |  | 407 |  | 115 |  | 522 |
Acquisitions (Note 4(R) and 4(T))(2) | — |  | 300 |  | — |  | — |  | — |  | 139 |  | — |  | 439 |
Disposals(3) | (2) |  | (389) |  | (260) |  | — |  | (34) |  | — |  | (19) |  | (704) |
(Impairment) reversals (Note 7) | — |  | 448 |  | — |  | (2) |  | (15) |  | — |  | — |  | 431 |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | (62) |  | 11 |  | 2 |  | 26 |  | — |  | — |  | (23) |
Retirement of assets | — |  | (158) |  | (26) |  | (7) |  | (10) |  | — |  | — |  | (201) |
Change in foreign exchange rates | (1) |  | (63) |  | (40) |  | (17) |  | (3) |  | (4) |  | (6) |  | (134) |
Transfers(4) | — |  | 103 |  | 22 |  | 319 |  | 25 |  | (514) |  | 16 |  | (29) |
As at Dec. 31, 2019 | 91 |  | 6,116 |  | 1,671 |  | 3,574 |  | 1,226 |  | 228 |  | 489 |  | 13,395 |
Additions | — |  | — |  | — |  | — |  | — |  | 478 |  | 8 |  | 486 |
Acquisitions (Note 4(K)) | — |  | — |  | 1 |  | — |  | — |  | — |  | — |  | 1 |
Disposals | (2) |  | (1) |  | — |  | — |  | — |  | — |  | (2) |  | (5) |
Impairment (Note 7) | (9) |  | (69) |  | — |  | (2) |  | — |  | — |  | (1) |  | (81) |
Revisions and additions to decommissioning and restoration costs (Note 23) | — |  | 21 |  | (11) |  | 8 |  | 76 |  | — |  | — |  | 94 |
Retirement of assets | — |  | (35) |  | (12) |  | (7) |  | (3) |  | — |  | (1) |  | (58) |
Change in foreign exchange rates | (1) |  | (37) |  | 45 |  | (14) |  | (2) |  | — |  | 6 |  | (3) |
Transfers(4) | 17 |  | 142 |  | (263) |  | 33 |  | (29) |  | (211) |  | (120) |  | (431) |
As at Dec. 31, 2020 | 96 |  | 6,137 |  | 1,431 |  | 3,592 |  | 1,268 |  | 495 |  | 379 |  | 13,398 |
Accumulated depreciation |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | — |  | 3,765 |  | 1,128 |  | 1,161 |  | 830 |  | — |  | 154 |  | 7,038 |
Adjustments on implementation of IFRS 16 | — |  | — |  | — |  | (3) |  | (43) |  | — |  | — |  | (46) |
Depreciation | — |  | 304 |  | 77 |  | 136 |  | 97 |  | — |  | 16 |  | 630 |
Retirement of assets | — |  | (158) |  | (23) |  | (3) |  | (6) |  | — |  | — |  | (190) |
Disposals(3) | — |  | (170) |  | (255) |  | — |  | (14) |  | — |  | — |  | (439) |
Impairment reversal (Note 7) | — |  | 297 |  | — |  | — |  | — |  | — |  | — |  | 297 |
Change in foreign exchange rates | — |  | (52) |  | (16) |  | (4) |  | (2) |  | — |  | (2) |  | (76) |
Transfers | — |  | 10 |  | (11) |  | (3) |  | (22) |  | — |  | — |  | (26) |
As at Dec. 31, 2019 | — |  | 3,996 |  | 900 |  | 1,284 |  | 840 |  | — |  | 168 |  | 7,188 |
Depreciation | — |  | 352 |  | 76 |  | 142 |  | 133 |  | — |  | 14 |  | 717 |
Retirement of assets | — |  | (31) |  | (10) |  | (6) |  | (4) |  | — |  | — |  | (51) |
Disposals | — |  | (1) |  | — |  | — |  | — |  | — |  | (1) |  | (2) |
Change in foreign exchange rates | — |  | (35) |  | 18 |  | (4) |  | (2) |  | — |  | 2 |  | (21) |
Transfers | — |  | — |  | (212) |  | — |  | (29) |  | — |  | (14) |  | (255) |
As at Dec. 31, 2020 | — |  | 4,281 |  | 772 |  | 1,416 |  | 938 |  | — |  | 169 |  | 7,576 |
Carrying amount |  |  |  |  |  |  |  |
As at Dec. 31, 2018 | 94 |  | 2,172 |  | 836 |  | 2,125 |  | 508 |  | 200 |  | 229 |  | 6,164 |
As at Dec. 31, 2019 | 91 |  | 2,120 |  | 771 |  | 2,290 |  | 386 |  | 228 |  | 321 |  | 6,207 |
As at Dec. 31, 2020 | 96 |  | 1,856 |  | 659 |  | 2,176 |  | 330 |  | 495 |  | 210 |  | 5,822 |
(1) Includes major spare parts and stand-by equipment available, but not in service, and spare parts used for routine, preventive or planned maintenance, and the Australian gas pipeline. (2) 2019 includes $308 million related to the acquisition of the Keephills 3 facility with $300 million included in coal generation and the remainder in assets under construction. (3) In 2019, we sold the Genesee 3 facility and sold the major components of the Mississauga facility. In addition, Centralia sold boiler parts included in capital spares and other for a net loss of $17 million. The Highvale mine also sold trucks included in mining property and equipment for a net loss of $18 million. Both were recognized in other gains on the statement of earnings (loss). (4) 2020 transfers out of PP&E mainly relate to removing the Southern Cross assets from PP&E to a finance lease receivable and moving the Pioneer Pipeline and mine equipment to assets held for sale. 2020 transfers between the classifications of PP&E relate to the Centralia land purchase, the Sundance Unit 6 conversion to gas, the WindCharger project and planned major maintenance. 2019 transfers mainly relate to transferring the Pioneer Pipeline and US Wind Projects from assets under construction to coal generation and renewable generation, respectively.

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- Definition The disclosure of detailed information about property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73&doctype=Standard -URIDate 2019-03-27 + Details
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